Well, I've considered replacing the Whispernet with Wifi, and removing the amazon proxy stuff to allow it to work. It's not quite worth it for me. That's the 'easy' way.
Otherwise, you'd need a small microcontroller to manage some minimal WiFi chipset and talk PPP to the serial console. (or some custom daemon on the Kindle to talk to it, which would allow you to do things like turn WiFi on/off) There's probably plenty of room in the DX for this, but it's a good bit of work and I'm happy with it as is for now.
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